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  • Oxidation of triclosan by permanganate (Mn(VII)): importance of ligands and in situ formed manganese oxides.

    Author(s) : Jiang JinPang SuYanMa Jun

    Author Affiliation : State Key Laboratory of Urban Water Resource and Environment, National Engineering Research Center of Urban Water Resources, Harbin Institute of Technology, Harbin 150090, China.

    Author Email : majun@hit.edu.cn

    Journal article : Environmental Science & Technology 2009 Vol.43 No.21 pp.8326-8331

    Abstract : Experiments were conducted to examine permanganate (Mn(VII); KMnO4) oxidationoxidationSubject Category: Miscellaneous
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    of the widely used biocide triclosan (one phenolic derivative) in aqueous solution at pHphSubject Category: Properties
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    values of 5-9. Under slightly acidic conditions, the reactions displayed autocatalysis, suggesting the catalytic role of in situ formed MnO2. This was further supported by the promoting effects of the addition of preformed MnO2 colloids on Mn(VII) oxidations of triclosan and two other selected phenolics (i.e., phenol and 2,4-dichlorophenol), as well as p-nitrophenol which otherwise showed negligible reactivity toward Mn(VII) and MnO2 colloids, respectively. Surprisingly, phosphate buffer significantly enhanced Mn(VII) oxidation of triclosan, as well as phenol and 2,4-dichlorophenol over a wide pH range. Further, several other selected ligandsligandsSubject Category: Chemicals and Chemical Groups
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    (i.e., pyrophosphate, EDTAedtaSubject Category: Chemicals and Chemical Groups
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    , and humic acid) also exerted oxidation enhancement, supporting a scenario where highly active aqueous manganese intermediates (Mn(INT)aq) formed in situ upon Mn(VII) reduction might be stabilized to a certain extent in the presence of ligands and subsequently involved in further oxidation of target phenolics, whereas without stabilizing agents Mn(INT)aq autodecomposes or disproportionates spontaneously. The effectiveness of Mn(VII) for the oxidative removalremovalSubject Category: Miscellaneous
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    of triclosan in natural water and wastewater was confirmed. Their background matrices were also found to accelerate Mn(VII) oxidation of phenolics.

    ISSN : 0013-936X

    DOI : 10.1021/es901663d

    Record Number : 20093327764

    Publisher : American Chemical Society

    Location of publication : Washington

    Country of publication : USA

    Language of text : English

    Indexing terms for this abstract:

    Descriptor(s) : biocidesbiocidesSubject Category: Chemicals and Chemical Groups
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    , catalytic activitycatalytic activitySubject Category: Properties
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    , EDTAedtaSubject Category: Chemicals and Chemical Groups
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    , humic acidshumic acidsSubject Category: Chemicals and Chemical Groups
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    , ligandsligandsSubject Category: Chemicals and Chemical Groups
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    , manganese oxidesmanganese oxidesSubject Category: Chemicals and Chemical Groups
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    , oxidationoxidationSubject Category: Miscellaneous
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    , permanganatespermanganatesSubject Category: Chemicals and Chemical Groups
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    , pHphSubject Category: Properties
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    , polluted waterpolluted waterSubject Category: Miscellaneous
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    , pyrophosphatespyrophosphatesSubject Category: Chemicals and Chemical Groups
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    , removalremovalSubject Category: Miscellaneous
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    , wastewaterwastewaterSubject Category: Commodities and Products
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    , wastewater treatmentwastewater treatmentSubject Category: Miscellaneous
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    , water pollutionwater pollutionSubject Category: Miscellaneous
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    Identifier(s) : edetic acid, ethylenediaminetetraacetic acid, hydrogen ion concentration, potential of hydrogen, waste water, waste water treatment, waste-water treatment